Malicious PDF — malware analysis report

Static analysis result for SHA-256 54086b07990ee837…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 08:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8130607ce2538fbb08ca540117fa2ca6 SHA-1: 8d437d53f7d059d5e5de57f713b29be816c06ff1 SHA-256: 54086b07990ee83709129c4edd518d9bf539a2906913f0fd900bbcd525b4cbc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm hosted on compromised CMS uploads, designed to redirect users to other PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zmiz.hr/userfiles/file/jadamepi.pdf In PDF document text
    • http://vietdubai.com/userfiles/file/duruvuzumaburixaparape.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/tiluwek.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/kazukebawe.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/29978266406.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/vadedipag.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/74482514952.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4380072870.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d9gokqs1eutv815lk7t7pgkq4a/79183368107.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/75470315635.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bugedetifebukesenote.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/76437476363.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2d264c1---89843181852.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/49385601696.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/56165542188.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/72945952427.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/40383875377.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/wozuwilafezuvonabop.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/femopuxelas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1e82416a---begixejisamobi.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/6426520628.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/58346529655.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/lopimasituvipomejonugip.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/59784325807.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/54667098250.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/16266271863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kodi+setup+on+firestickPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 18300 bytes
SHA-256: 9024c6067b308d217eacdfa3c0d2c0e4a39fd2b426db7bc51d0724175e950ac4
font_01_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 10588 bytes
SHA-256: 4865b8742189513998bb063cfa18408bb4c52ea87c0cdc0d30cce8558e1d182d
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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